Skiving machine



July 3, 1934. -A. PETERSQN ET AL 1,964,329

SKIVING MACHINE Filed Jan. 25, 1933 2 Sheets-Sheet l July 3, 1934. A-.PETERSON ET AL SKIVING MACHINE Filed Jan. 23, 1935 2 Sheets-Sheet 2 memflafgwPeffaoW Patented July 3, 1934 SKIVING MACHINE Aaron Peterson andPhilip D. Jones, Chicago, Ill.

Application January 23, 1933, Serial No. 653,027

'7 Claims.

The invention relates to a skiving machine of a type more particularlyfor use in skiving the soles of shoes and the leather to be used on themwhen a new sole is to be applied.

In repairing shoe soles, it is difficult to finish and skive theremaining portion of the old sole so that a new sole may be securelyapplied with a flush surface at the adjoining ends.

The chief objects of this invention are the provision of a skivingmachine that is portable, compact, strong and durable, sturdy and simplein operation and in which the work support travels on an arc with thework in the path of a knife which is automatically adjusted as to theangle of its cutting edge depending upon the thickness of the leather;and whereby an old sole to be severed from the shoe is placed on thework sup port of the machine with the upper of the shoe below thesupport and the sole is skived at the required angle in the sameoperation; the sole being fed in an arc with the support affording adesirable condition at the arch of the shoe to apply a new sole.

Further objects are to provide means for yieldingly holding the worksupport in position and having manual means for releasing the support topermit of the starting or the withdrawal of the work.

These features are accomplished by means of the machine disclosed in thedrawings forming a part of the specification; and in which;

Figure 1 is a side elevation of the machine.

Figure 2 is a top plan View.

justing the knife bracket.

Figure '7 is an enlarged perspective view of the knife blade.

Referring tothe drawings, 10 designates the frame of the machine as awhole, which is substantially U-shaped, having a base 11, an uprightportion 12 and a horizontally extending top portion 13.

The portion 13 has an integral downwardly extending lug 14 at itsoutward end providing a bearing for a horizontally extending shaft 15which has its other end journaled in the upright 12 of the frame 10.

Outwardly of the portion 13 adjacent the lug 14, the shaft 15 has aknurled feed r001 16.

The knurled feed roll 16 is fixed to the end of the shaft 15 outwardlyof the portion 13 adjacent the lug 14, and is driven by means of a gear17 fixed to the other end of the shaft 15 which is in mesh with a smallfer gear 18 fixed to a relatively short shaft 19 journaled below theshaft 15 in the upright 12. The gears 17 and 18 are mounted to rotate ina vertically extending elongated slot 20 in the upright 12 which guardsthe gears from the operator. A crank handle 21 is attached to the shaft19 to manually rotate the feed roll 16 through the gears 18 and 17.

A work support 22 is pivotally mounted for horizontal swinging movementon a vertical shaft 23 which is supported in the base 11 at its lowerend and in a lug 12a extending from the upright 12 at its upper end,below the shaft 12.

The support 22 extends outwardly of the vertical shaft 23 and issomewhat fan-shaped at its free end, forming a relatively wide flat worksur- 7'5 face 24 under the feed roll 16. This surface 24 terminates in acircumferential edge 24a and in a concentric edge 25 of a raised flatportion 26 rearwardly of the work surface 24 on which a plate 2'7 havinga concentric edge 27a is secured 30 with its edge extending over theedge 25 forming a groove or guideway 28 inwardly of the work surface 24.At the work receiving end of the surface 24 the groove or guideway 28extends beyond the starting edge 24b for guiding one end of a knifeblade in the path of the work while the support is moved to startingposition.

To normally hold the work support 22 in elevated position, so as toyieldingly maintain the surface 24 in close proximity with the feed roll16, a cross-member 30 on which the lower end of the support 22 rests, ismounted for vertical sliding movement on the guide pins 31--31positioned in the base 11 on each side of the vertical shaft 23. Thecross-member 30 rests on the compression springs 23a mounted in the base11.

A wear member 32 rests on the member 30 and is also guided on the pins3131 with its top surface in contact with the face of a cam 33 fixed toa short shaft 34 mounted horizontally in the upright 12 and providedwith a lever-handle 35 for actuating the cam. To support thelever-handle 35 in operative position, an upwardly extending stop pin35a is fixed to the base and engages the underneath side of thelever-handle.

As thus far described, the support 22 is mounted for horizontal swingingmovements and is also yieldably supported for vertical movements,permitting the support to be depressed during its swinging movement,compensating for the vari- 110 ation in the thickness of material, whilethe material is gripped between the surface 24 of the support 22 and thefeed roll 16.

When it is desired to insert or remove the material from the machine,the lever-handle 35 is lifted, turning the cam 33 which will depress themembers 32 and 30 against the tension of the springs 23a, releasingtheir tension on the sup port 22, and the support will follow of its ownweight. It will be noted that the member 32 overhangs the lower lug 22aof the support 22 (Fig. 1) to positively insure the vertical downwardmovement of the support when the leverhandle 35 has been lifted.

The cross-member 30 is provided with inwardly directed lugs 30aextending into the path of travel of support 22 on each side of thelower lug 22a to limit the swinging movements of the support withrespect to the feed roll 16.

The top portion 13 of the frame 10 has an integral horizontal extension13a at its free end to which a bracket 37 is adjustably mounted forsupporting a knife blade holder 38. As shown in Fig. 6 the bracket 3'7is provided with an arcuate underneath surface 39 which rests on theextension 13a and is adjustable with respect to the frame by regulatingthe cap screws 40 that secure the bracket to the extension 13a.

At its outward end the bracket 37 is downwardly turned and is providedwith a transverse inclined bore 37a to receive the threaded shank 41 ofthe blade holder 38 which is held in place by means of a knurled nut 42threaded to the shank and provided with an annular groove or race 43.

The bracket 3'? is provided with a slot opening &4 alined with theannular groove or race 43 into which a U-key 45 extends to retain thenut 42 rotatably mounted while adjusting the blade holder with respectto the bracket.

A lock nut 4'7 is threaded to the shank 41 of the blade holder tosecurely lock the nut 42 to the shank, permitting of a rocking motion ofthe blade holder while held with respect to its longitudinal movement.

The holder 38 is provided with a dove-tail 48 into which a knife bladehaving a corresponding dove-tailed edge is inserted and securely held bymeans of the set screws 50.

The knife blade 49 has its free end portion out at an angle 51 providinga cutting edge longer than the back portion of the blade, forming apoint 52 that extends into the groove 28 on the work support. a

With this arrangement of a blade. holder and knife blade having its freeend guided in a groove in the support, it is only necessary to adjustthe blade position in the holder 38 so as to have the point 52 in thegroove 28 while the support 22 is normally at rest and the holder andthe cutting edge of the blade on a horizontal line with respect to thefeed roll. The angle of the skived edge of the shoe sole and the leatherto be applied thereto, depends upon its thickness, as the thickness ofthe leather between the support 22 and the feed roll 16 causes thesupport to be depressed against the tension springs 23a, causing theknife blade to be rocked on the shank 41 in'the bracket 38 therebyautomatically adjusting the cutting angle of the knife. As the materialto be skived is placed into the machine and the support is depressed bymeans of the lever-handle 35, the lever-handle is then restored to itsresting position on the pin 35a, permitting the tension of the springs23a to maintain a constan yielding presser on the work to compensate forany irregularity in the material.

It is common practice to skive the sole of a shoe at the instep when anew half sole is to be applied, and with a device as above described,the skived edge is uniform and smooth as the work when once placed inthe machine travels with the work support, the portion being severedalso rests on and travels with the support, thereby feeding the sole ofthe shoe in a horizontal path and preventing the portion being severedfrom sagging.

We contemplate as being included in these improvements all such changes,variations and departures from what is thus specifically illustrated anddescribed as fall within the scope of the appended claims.

We claim:

1. A skiving machine comprising in combination a frame, a work supporthaving guide means thereon and pivotally mounted to swing in a path onsaid frame, a work feed element coacting withthe free end of saidsupport, a knife supported for rocking movement on the frame in the pathof the work travel with its free end guided in said guide means, andtension means permitting yieldable vertical movement of the supportwhile in its swinging movements.

2. A skiving machine comprising in combination a frame, a work supporthaving an arcuate groove therein near the free end thereof and pivotallymounted to swing in a path on said frame, a blade having a cutting edgeand supported at one end for rocking movements on the frame in the pathof the work travel, said blade having its free end guided in the arcuategroove in said support, a knurled feed roll pivotally mounted on theframe in the path of the work travel, spring tension means exerting apressure against a downward movement of the support, and means includingreduction gearing for rotating the feed roll to grip and feed the workinto the path of the knife.

3. A skiving machine comprising a substantially U-shaped frame, a worksupport having an arcuate groove therein and mounted for swingingmovement on the frame, a knife blade pivotally mounted at one end in abracket on the frame, said bracket being adjustable with respect to theframe, said blade having its free end guided in said groove in the worksupport with the cutting edge in the path of the work, and a feed rollerjournaled in the frame to grip and feed the work into the path of theknife blade while the support is traveling with the work.

4. A shoe sole skiving machine comprising a substantially U-shapedframe, a work support having an arcuate guide means therein, saidsupport being mounted for swinging movement adjacent one leg of theframe providing a space therebetween, a knife pivotally mounted at oneend in a bracket on said leg of the frame in the path of the worktravel, said knife blade having its free end guided in said arcuateguide means in the support, and a feed roller journaled in said leg ofthe frame in the path of the work to grip and feed the work into thepath of the knife to skive the sole of a shoe, permitting the severedportion thereof to freely pass through said space.

5. A machine for severing and skiving a shoe sole comprising incombination a frame having an overhanging portion, a Work support havingguide means thereon and being pivotally mounted for swinging movement onthe frame adjacent the overhanging portion providing a spacetherebetween, a knife blade having one end pivotally mounted in abracket on the frame with its free end engaged by said guide means onthe support, and a feed roller journaled in the overhanging portion ofthe frame to advance the work into the knife blade, the severed portionof the sole being free to pass through said space.

6. A device of the character described, comprising a frame, a worksupport having guide means thereon and being pivotally mounted on theframe to swing in a path, a feed roller on said frame coacting with theWork support, an adjustable bracket on the frame for supporting a bladeholder, the blade holder being pivotally mounted and adjustablysupported in said bracket, and a knife blade carried by and adjustablysupported in said blade holder with its free end engaged by said guidemeans.

7. A device of the character described, comprising a frame, a worksupport having guide means thereon and being pivotally mounted on theframe to swing in a path, a feed roller on

